Composition for preventing set-offs in printing.



UNITED sr rEs GEORGE STEELE DUNCAN AND GEO SCOTLAND, ASSIGNORS :;TO AMERICAN OFFSET COMPAN YORK, N. Y., A. CORPORATIONOF NEW YORK,

GQMPOSITlON FOR PREVENTING SET-OFFS IN PRIN To all whom {km/r4; concern: Be it known that we, GE()RGESTE] 1LE DUN- CAN and GEORGE HENRY Po'rrs, subjects of the King of the Britain and Ireland, residing at Edinburgh, Scotland, ha veinventedcertain new and useful Improvements in. Compositions forv PreventingSet-Olfs in .lrinting, of: which the followingis a specification. i

This lnventionhas for its object to. provide an. improved composition toprevent set-oil or-transferof ink from one sheet; to another or from one side to the reverse side of asheet inprinting, the said composition being particularly appliealde foruse in rotary prii'iting-pres ,rotary presses form agazineprinting,- per Tug-machincs, andv flat-bed single-cylindermachines. This invention in its preferred embodiment'consists ofa liquid composition which is particularly.designed:to be used for dam pening the set-oll'(rollers ol" printing-presses, althoughitis adapted 'il or'use in" an y' manner 'lorwyrhieh anti-set-ot compositions arc'or may be used; 1

Thecomposition e ontprises in its preferred embodiment soap, prel'eraldy soft soap; a resinous subst-am-ie, preferably turpcn'tine, a non-volatile oil, preferably a non-dhying oil, suclras oliyesoil, a non-volatile oxidizingoil, preferably boiled linseed-oil, a stable-lu-- bricating-oil,- prel'erablfv mal s-footoil, a highlv-volatile mineral solvent, preferably naphtha,- and an organic solvent, preferably inctlrvlated spirits. The proportions in which we prefer to mix the above-named ingredients are as follows: equalyolumes of each of the oils that is to say, equalvolnines of neatsl'oot oil' andboiled linseed-oil, equal volumes of methylated spirits and naphtha, the volume of each of these being aboutwhall' the volume of the boiled linseedoil. 'lhevolumeo'l' the turpentine is prefer ably keptalittle less 1 hanhalf t he volume of the boiled linseed-oil; 'llie soap should be presentin a. proportion of about one pomp] .to every 'l'ourqunrts of turpentine. 7

While the ingredients and proporti above given are thosewhichare'prel'erret is to be understood that. this invention is limited thereto, varied within \vide limits and certain ofthe ingrwlients omitted .and equivylmits of the not Specification of'Letters Patent. 7 Application filed May 8,1905. Serial-No. 259,374.

United. Kingdom-of Great as the proportions maybe PATENT OFFICE. ra a Y, OF NEW TlNG r- Patented'ifune 1-9, 1906'.

ingredients substituted in their invention is to be considered asbroadly embracing the features of novelty in a composition for the purpose specified, as defined within the scope of the appended claims.

Amon'gthe changes which may be made in this composition WVithOllt. departing from thspirit of the invention'or niateri'ally'sacrific ing the advantages thereof may be mentioned the following, which are, however, to. be con sidered. asmerely' illustrating a few of the many changes which the skill and experience of Workers in'the art will naturally suggest: The neats-foot oil and the olive-oil are practieally iilterchangeable-that is to say, one may be more or less con'rpletelyreplaced by the other; In place of the naphtha benzene orbthcrsimilar volatile solvent may be used, but naphtha is preferred. The proportion of the; boiled linseed-oil may bewidely varied; but the best results have been obtained when the proportion of this ingredient is not din-rinished'nor increased by more than onethirdof the proportion indicated above. The proportion oft'h'e methylated spirits or naphtha'orboth of. these may be very consideraldy increased without seriously affectingtlfe' characterotthe liquid, and the proportion of the naphtha 1n ay be materially diminishedi without impairing the usefulness oftlieliquitl. The proportion of the soap may be materially varied, and Where the composition is to be used with rotary machines it c increased. \Vhere the proportion of the .soapis increased, it-has been found that the best results are obtained. bycorrespondingly increasing, theproportion of the. naphtha.

n preparing the composition,.as it is do sirabl I good.amadinixturo of is preferable to defer after this heating of the tot place.

"the soap possible, it

and to take only one-third addthc' soap and stir well, the'temporature to about 130 Fahrenheit,

000] under is eool,"-ad.d it to the remainin vhich in the meant. added. i The liquid is preferabiyapplied by a cloth or two-thirds, to

BY POTTS, OF EDINBURGH,

e to'apply heat to bring about as ad(li'ng-tlie'naptha until f then turn oil' the heat andallow tlieliquid to gentle stirring. When the liquid ime naphtha has been The an be ad vantageously' lnatcniallyj alvolume'of. the liquid previous to theaddltlon of. the napthaand to tlns tlnrd gradually. raising saturated with it and the principal lubricating-roller thereby given a good soaking. The frequency of the applications of the liquids for a given quantity of Work depends largely on the q utility of the ink. Witha rotary machine, it good ink is used, the initial dampening will suffice during the running of the reel, whereas with inferior ink the same machine and the same work may require a further appli cation of the liquid when only half the reel is run.

Having thus described our invention, what we claim, and desire to secure by Letters Pat- 7. A composition for preventing set-off comprising a non-volatile oil, turpentine, soap and a volatile solvent.

8. A composition for preventin seto1'i comprising a non-volatile oil, turpentine, soap and a volatile mineral solvent.

9. A composition for reventing set-elf comprising a non-volati e oil, a resinous sub- I stance, soap, a solvent of soap and an oxidizing-oil.

10. Acomposition for reventing set-off comprising a non-volati e oil, a resinous liquid, soap, a solvent of soap and. linseed-oil.

11. A composition for preventing set-oft comprising a non-volatile oil, turaentine, soap, a volatile mineral solvent an boiled linseed-oil.

12. A composition for preventing set-elf comprisinga non-drying oil, resinous substance, soap, a volatile solvent, an oxidizingoil and a stable lubricating-oil.

13. A composition for preventing set-oil comprising a non-drying oil, a resinous substance, soap,a volatile solvent, an oxidizingoil and neats-foot oil.

14. Acomposition for preventing sct-ofl' comprising a non-volatile oil, turpentine, soap, a volatile mineral solvent, boiled linseedoil and neats-foot oil.

15. Acomposition for )reventing"set-off comprising a non-volati 0 oil, a resinous liquid, soap, a volatile mineral solvent, an oxidizing-oil, a stable lubricating-oil and an organic solvent.

16. Acomposition For )reventing"set-oil comprising a non-volatile oil, a resinous liquid, soap, a volatile mineral solvent, an oxidizing-oil, astablelubricating-oil and lnotliylated spirits.

17. A composition for preventing set-oil comprising a non-dryingoil, turpentine, soap,

a volatile solvent, linseed-oil, ncatsioot oil and an organic solvent.

18. A composition for preventing set-oil comprising olive-'oil, turpentine, soap, naphtha, boiled linseed-oil, neats-l'oot oil and methylated spirits, in substantially the proportions specified.

In testimony whereof we have signed our names to this specification in the presence ol two subscribing witnesses.

GEORGE S'llClClilC DUNCAN. GEORGE [1 FN HY POTTS. Witnesses:

WALLAeu FAIRWICA'IIIER, Jxo. ARMs'ruoNc, Junr. 

